topic Re: Need helps with kernel parameters in Operating System - HP-UX

Need helps with kernel parameters

Hoang Chi Cong_1 — Wed, 06 Jun 2007 02:11:12 GMT

Hi all

We are planing to upgrade the production server by replace with the new one:
Current: rp4440 6CPU, 16 GB of RAM
New server: rp4440 8 CPU, 64GB of RAM.

My question is: Will I need to change any kernel paramenter when upgrade from 16GB RAM to 64GB RAM? Or will I have change any thing to suitable with the new server or I just keep the kernel parameters same with the old server?

Thanks in advanced!

Re: Need helps with kernel parameters

Steven E. Protter — Wed, 06 Jun 2007 02:55:38 GMT

Shalom,

That depends.

You will not be forced to change the kernel immediately.

If you are making the upgrade to provide more shared memory to Oracle for example, you will need to adjust the shmmax parameter.

Making some adjustments is recommended but not urgent. Really depends on what the server is supposed to do.

Tell me in general about what applications the server runs and I'll make some specific recommendations.

Shmuel

Re: Need helps with kernel parameters

mavrick — Wed, 06 Jun 2007 03:16:59 GMT

Hi,
You can check with Database and Aplication Team for any changes required in dpt_max_pct value and swap related parameters. If any changes in number of users/processes increased in new environment you may look into the nproc values...other than normally no changes ..thanks

Re: Need helps with kernel parameters

Steven E. Protter — Wed, 06 Jun 2007 03:19:39 GMT

Shalom,

If your OS is HP-UX 11.23 there may be benefits in increasing max_dbc_pct and min_dbc_pct

For earlier OS, those figures should be low, in the 5-10 range and close together.

I'd recommend the following areas to look at:

shmmax
shmseg
maxssiz
maxssiz_64
maxdsiz
maxdsiz_64

SEP

Re: Need helps with kernel parameters

Yogeeraj_1 — Wed, 06 Jun 2007 03:58:54 GMT

hi,

Concerning Kernel parameters, you may have to increase some of them if you are forecasting an increase in the performance demand.

However, if you will be running the same applications/databases then it will be cautious not to do any changes immediately..

kind regards
yogeeraj

Re: Need helps with kernel parameters

Hoang Chi Cong_1 — Wed, 06 Jun 2007 19:45:54 GMT

Thanks to all for your replies

Steven E. Protter: My OS version is 11.11

and my application is a Banking system...so sensitively.....

I just increase the swap disk (lvol2) from 8GB to 16GB because the internal disk now upgrade to 146GB, more bigger than the old server with 36GB of internal disk.

Yep, you have a good idea....we are running with Oracle and Tuxedo and increase the share memory of Oracle is my thinking of....

Thanks you.

Re: Need helps with kernel parameters

skt_skt — Wed, 06 Jun 2007 22:58:25 GMT

Find out the mem requierment from Oracle/App team and update following kernel parms which need a reboot. I had couple of suggetion to increase this values as it will define the stack size and data size respectively.

maxssiz
maxssiz_64
maxdsiz
maxdsiz_64

shmmax can be done dynamically later depending on requierment.